HUD short for Head Up Display.It displays driving data on the car windshield such as speed,RPM,water temperature,trip distance etc;avoiding drivers unsafely because of watching the instrument while driving.Drivers can read the driving information instantly, and always keep the best state on the way with HUD.Available for 100% car with OBD2 + GPS, Easy to install, plug and play. But if use GPS port, because the GPS has no signal in the tunnel, the speed will not show on the displayed.OBD2 + GPS models: C800 Language: English Data measurements: Speed, Fuel consumption, RPM alarm, Shift reminder, 4-stage alarm, Single over speed alarm, Brightness adjust, Water temperature alarm, Voltage alarm, Fatigue driving alarm.Package Contents: 1 x C800 Head Up Display, 1 x OBD Cable, 1 x Non-slip mat, 1 x English User Manual,1 x Clean cloth, 1 x GPS Cigarette lineWorking voltage: 11V~18VDC (12vdc/200ma),please use a USB cable when voltage higher than 24V.Q&A A: Please make sure that your car has equiped OBD2 or GPS certificate Port. Q&A B: Driving speed this HUD displays is 5km faster than actual speed by factory default in order to help car drivers not drive overspeed. You can adjust it to your personal preference.

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